At D8, Steve Jobs said that Apple's move to block outside ad agencies from collecting user…
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In the humorously and appropriately titled company blog "The Life and Times of AdMob," AdMob CEO Omar Hamoui expressed his displeasure, and explained why you—users and developers—should be displeased, too:

Let's be clear. This change is not in the best interests of users or developers. In the history of technology and innovation, it's clear that competition delivers the best outcome. Artificial barriers to competition hurt users and developers and, in the long run, stall technological progress.